Redmine Automation / Variable filter

What are variable filters?

Variable filters are data manipulation functions that are appended to standard variables and modify their output before use.

Basic principle:

  • Normal: %VARIABLE% → outputs stored value
  • With filter: %VARIABLE|FILTER% → processes the value before output

Advantage: Converts static variables into calculated values—directly within the automation rule, without external tools or manual post-processing.

Redmine Automation Plugin Variables

More than just copying data

Standard automation only transfers values. But what if you need to calculate deadlines from start dates, add buffers to time entries, or anonymize user data? Variable filters extend your automation rules with calculation and formatting functions.

Four powerful filter categories

  • Text filter: Formatting (|upper, |lower, |length)
  • Calculation filter: For buffers and calculations (|calc+5, |calc*1.2)
  • Date filter: Set time calculations and deadlines (|calc+14 for +14 days)
  • Hash filter: For anonymization via hashing (|hash, |sha256)
Redmine Automation Plugin Variables

Practical applications

Use Case: Intelligent calculations
Automatic effort and time calculations without manual rework (available operators: basic arithmetic operations)

Use Case: data protection compliance
GDPR-compliant anonymization via secure hash generation

Use Case: system integration
Provide raw data formats for various APIs and external systems

Who can benefit most from variable filters?

Variables for filters are for people who already create automation rules and need advanced workflows. Ideal for technical Redmine administrators.

Required expertise

  • Confident Redmine administration
  • Experience with automation plugins
  • Basic understanding of data types and calculations

Not suitable for

  • Occasional users without technical experience
  • Teams that only need simple ticket creation

Getting Started: Introduction to variable filters

Step 1: Understand the basics

Learn the standard variable syntax of the Automation plugin

Step 2: Test simple filters

Start with string filters such as |upper or |lower

Step 3: Incorporate calculations

Test numerical filters with |calc for simple expense calculations

Step 4: Complex workflows

Integrate date and hash filters for advanced use cases (e.g., user.name|sha256)

The use of variable filters is just one of the many useful plugin functions of the Automation Plugin. The plugin requires the Reporting Plugin as a basis and is part of the Automation Bundle and Enterprise+ Bundle. Availability of variable filters: Part of the current version

Redmine Plugin

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* Offer is directed exclusively to entrepreneurs within the meaning of §14 BGB. All prices are in EUR and net prices. Plus the applicable statutory sales tax. Reverse Charge applies for international clients outside Germany with a valid EU VAT ID No. Delivery of the download URL against advance payment. Plugin installation is done by the client himself, according to our installation instructions. Note the minimum system requirements and FAQ before purchase.
1) does not run stand-alone. Requires Redmine Reporting. Affects: Automation, HRM, DevOps, ServiceDesk

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